Hi @KLemmon .
Here is what I have working.
The Spreadsheet:
Note: The "Date" column is a general string format free typed as 03/26/2019. When using a "Date" format I only get integer based output although you can see how you get on with your format.
Here is the Flow that books an event.
The condition:
1:
not(empty(items('Apply_to_each')?['Customer']))
is equal to
true
2:
formatDateTime(items('Apply_to_each')?['date'], 'MM/dd')
is equal to
formatDateTime(utcnow(), 'MM/dd')
The Create an event:
Start Time (9 am):
addHours(startOfDay(utcnow()), 9)
End Time (12pm):
addHours(startOfDay(utcnow()), 12)
You may need more like (possibly, I'm from the UK which is UTC)
addHours(startOfDay(convertTimeZone(utcnow(), 'UTC', 'Eastern Standard Time')), 9)
addHours(startOfDay(convertTimeZone(utcnow(), 'UTC', 'Eastern Standard Time')), 12)
You will need to test if this works with your date format from excel, my testing hasn't worked but you manage.
I at least hope this gets you further on or if you change the date format in excel it will work when using UTC.

If you have found my post helpful, please mark thumbs up.
Any other questions, just ask.
Thanks, Alan